<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>{% block title %}父模板title{% endblock title %}</title>
</head>
<body>
    <h1>导航条</h1>
    {% block b1 %}
        base里的内容
    {% endblock b1 %}
    <h1>版权</h1>
</body>
</html>